2012-06-20_PERMIT FILE - C2010089 (57)

Home Browse Search

COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division Rationale, Page 5, COG - 0850000 Coal Mining General Permit TableIIl3a: Effluent Limitations and Monitorin Re'uirenients— Post Minin reclamation Areas Permit Requirements Continuous / Flow, MGD Footnotes 1 - 4, * * *, and * ** - See Footnotes under Table 111 - 1 and Table 111 Settleable Solids, rn1/1 Report NA Report Discharge Evaluation - InstarttaneousZ Water Quality Standards State Effluent Regulations State Effluent Regulations pH, s.u. N/A NA Total Suspended Solids, mg/1 30 45 Oil and Grease, mg/t N/A NA -Federal Effluent Limitation Guidelines Settleable Solids, rn1/1 Report NA 0.5 Federal ELG ----------------------- -Site Specific Limitations Total Dissolved Solids, mg/1 * Report NA Report Salinity Regulations Total Phosphorus (as P), mg/1 ** Report NA Various Control Regulations Total Recoverable Iron, ug/t * ** 1000 NA NA Water Quality Standards Other Pollutants of Concern Various NA Various- Water Quality Standards Whole Effluent Toxicity (WET) Chronic Stat Diff and IC25 > IWC State Permit Limitations Acute LC50 > 100% State Permit Limitations 6.5 -9.0 NA 10 Weekly Weekly Weekly Weekly Quarterly 4 Monthly Weekly Weekly Quarterly Effluent Limitation Guidelines-------------------------------- Report NA Report Federal ELG Weekly Recorder / In -situ 2 - Grab Grab Visual 3 Grab Grab Grab Grab Grab 3 Grab/Test:' Grab Alternate Limitations For Post-Mining Reclamation Areas - Table III -3b contains limitations for any discharge or . increase in the volume of a discharge from a reclamation area, caused by precipitation within any 24 -hour period greater than the 10 yea, 24 -hour precipitation event (or snowmen of equivalent volume) may substitute the following limitations for these specific parameters only, subject to burden of proof requirements described in Part 13.4 of the permit. Table III -3b: Alternate Ef uent Limitations and Monitoring Requirements Post Minin_ reclamation Areas Grab b. Post Mining Underground Areas — Table 111-4 applies to this category, subject to 40 CFR Part 434 Subpart E (post `_`' Mining Areas). The following limitations apply to underground areas. The federal ELG limitations would apply until bond release. If these wastewaters are combined with other waters under Part LB. 1, then those limitations shall apply,'"' If this wastewater is combined with post mining reclamation area wastewater, then these limitations apply to the . . combined discharge. If the post mining wastewater is separate, then the following limitations apply. Discharges of mine • drainage from underground workings of underground mines which are not commingled with discharges eligible for - alternate limitations set forth in this section shall in no event be eligible for the alternate limitations set forth in this section.